- How do I know if my disc rotors are worn?
Sounds like a stupid question I know but I have never replaced worn rotors.
I have some SH (from here) old style Hope Mono Minis the black and gold ones. After swapping the wheels today I noticed that there is a groove running all the way round both discs. Its had to explain where the groove is, its on the arms that connect the centre of the rotor (where the bolts are) to the outer braking surface. It looks like the pads have been using these arms for braking and not just the outer circular bit is this normal?
I think his may be causing my front brake to have excessive leaver travel. I dont have any other discs this size or know anybody who has and dont want to just go and buy new rotors to try it out. Does anybody have any experience with this.
BTW I am not complaining about the sale or the condition the brakes were in when I got them just trying to diagnose the problem.
Thanks all.Posted 9 years agoTandemJeremyMember
There will be a minimum thickness advertised for the rotors. If you can feel a ridge where you do then they are worn but worn out? Hard to tell without measuring to spec. It will not cause excessive lever travel as the calipers should self adjust. Likely to be a sticky pistonPosted 9 years agostumpy01Member
I have got that ridge on my old Julie disc rotors – it’s on the arms that join the actual rotor to the 6-bolt part of the disc, just inside the rotor itself.Posted 9 years ago
It was caused on mine by a dimple on the ear of the Julie pads. It seems to be some kind of wear indicator, as when the pads get down to this level, the dimple starts pinging on the arms of the rotor. As the pad backing metal is so soft though, it is more cosmetic damage than a serious amount of wear.stevehSubscriber
NOt enitrely helpful but if you do want some new ones they can be pretty cheap from these guys, good service too. http://www.mtb-direct.co.uk
How worn are the pads? If the pads are decent then the relatively small amount of missing rotor shouldn’t be an issue. If the pads are knackered as well it can make a minor problem worse.Posted 9 years ago
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